US20040235401A1 - Truing tool for truing a grinding worm - Google Patents
Truing tool for truing a grinding worm Download PDFInfo
- Publication number
- US20040235401A1 US20040235401A1 US10/828,702 US82870204A US2004235401A1 US 20040235401 A1 US20040235401 A1 US 20040235401A1 US 82870204 A US82870204 A US 82870204A US 2004235401 A1 US2004235401 A1 US 2004235401A1
- Authority
- US
- United States
- Prior art keywords
- truing
- gear wheel
- tool
- grinding worm
- roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
- B24B53/075—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels for workpieces having a grooved profile, e.g. gears, splined shafts, threads, worms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
- B23F23/12—Other devices, e.g. tool holders; Checking devices for controlling workpieces in machines for manufacturing gear teeth
- B23F23/1225—Arrangements of abrasive wheel dressing devices on gear-cutting machines
- B23F23/1231—Arrangements of abrasive wheel dressing devices on gear-cutting machines using a gear-shaped dressing tool
Definitions
- the invention relates to a truing tool for truing an essentially cylindrical grinding worm that is arranged on a tool spindle of a machine suitable for the continuous generation grinding in the tangential or diagonal process.
- Cylindrical grinding worms are used for the continuous generation grinding of gear wheels. Because the grinding worm is subject to natural wear and tear during this process, it must be trued from time to time. In the truing process, material is machined off the flanks or the treads of the grinding worm so that the head area of the thread(s) is getting narrower. Therefore, in addition to the tool for the profiling of the grinding worm, a tool is also required to adapt the diameter of the addendum circle of the grinding worm. The diameter of the addendum circle is decreased such that the head area of the thread(s) of the grinding worm again has the originally provided width.
- the means for truing the grinding worm therefore comprises two separate tools.
- the tool for the profiling of the flanks of the grinding worm for example, can be a profile-grinding wheel.
- the truing of the grinding worm is generally not effected at the place on the machine where the workpiece, i.e. the gear wheel, will be machined later on.
- the invention is based on the problem to develop the generic truing tool such so as to simplify the loading concept and shorten the duration of the machining of the grinding worm.
- a truing tool that is characterized by an essentially cylindrical gear wheel having an abrasive coating on the surface that is active during truing to profile the flanks of the grinding worm, and an essentially cylindrical roll having an abrasive coating on the circumferential surface to adapt the diameter of the addendum circle of the grinding worm, with the gear wheel and the roll being axial- and torsion-resistantly connectable to the work piece spindle of the machine.
- the gear wheel and the roll can be developed such that they can be connected axial- and torsion-resistantly to the work piece spindle independent of one another. For various reasons, however, it is more advantageous that the gear wheel and the roll are connected to one another with torsion strength and that they can be connected to the work piece spindle axially and torsion-resistantly as a tool unit.
- the gear wheel and the roll could be developed in one piece. In this case, however, the entire tool must be replaced if the gear wheel is worn out, even though the roll has a significantly longer service life than the gear wheel.
- a gearwheel 2 is clamped on the upper free end of the work piece spindle 1 in the illustration.
- the gear wheel is being precision-machined with a cylindrical grinding worm 3 indicated by an elliptical outline.
- the grinding worm 3 is arranged torsion-resistantly on a tool spindle (not shown). Because the construction of a machine used for the continuous generation grinding is principally known, a detailed explanation of the machine is not necessary.
- the free end area of the work piece spindle 1 turns into a cylindrical area with an enlarged diameter via a conical area, with a ring shoulder connecting to said cylindrical area with enlarged diameter.
- the work piece spindle 1 has a ring flange 5 with borings 4 to attach on a drive shaft of the machine.
- a truing tool to true the grinding worm 3 is comprised of an essentially cylindrical truing gear wheel 6 (simply referred to as “gear wheel” in the following) and of an essentially cylindrical truing roll 7 (simply referred to as “roll” in the following) which are combined into one tool unit in the manner described below.
- the gear wheel 6 has an abrasive coating on its surface that is active during truing, i.e., in the area of the tooth flanks.
- the roll 7 also has an abrasive coating on the circumferential surface.
- the gear wheel 6 and the truing roll 7 have the same interior diameter, which is slightly larger than the outer diameter of the cylindrical area of the work piece spindle 1 .
- the gear wheel 6 and the roll 7 have corresponding annular projections and/or recesses for reciprocal centering.
- the gear wheel 6 and the roll 7 have a plurality, preferably three, aligned borings, with the borings developed in the gear wheel having a larger diameter, for reasons explained below.
- Corresponding tapped holes 9 are arranged in the ring shoulder of the work piece spindle 1 .
- a locking screw 12 is first inserted into the borings of the gear wheel 6 , and then a threaded bushing 10 is screwed onto the locking screw and countered with a nut 11 .
- the gearwheel 6 has a plurality, preferably three, staggered borings across the circumference.
- the roll 7 has corresponding tapped holes so that the gear wheel 6 and the roll 7 can be connected torsion-resistantly with the screws 8 .
- This tool unit which is formed by the gear wheel 6 and the roll 7 , is arranged on the cylindrical area of the work piece spindle 1 .
- the locking screws 12 are then screwed into the corresponding tapped holes 9 of the work piece spindle 1 so that the gear wheel 6 abuts the ring shoulder of the work piece spindle.
- the segment of the cylindrical area of the work piece spindle 1 that borders the ring shoulder has a slightly enlarged outer diameter, which results in a press fit with the gear wheel 6 .
- the tool unit comprised of the gear wheel 6 and the roll 7 is therefore axial- and torsion-resistantly connected to the work piece spindle 1 in concentric arrangement.
- the tool spindle and the work piece spindle 1 are moved relative toward one another to engage the grinding worm 3 and the gear wheel 6 under a suitable angle.
- the flanks of the grinding worm 3 are then profiled in a tangential- or diagonal process. In doing so, only the technological variables such as infeed, feed and rotational speed of the grinding worm 3 must be coordinated with the specific truing task. All movements required for the truing of the grinding worm in the tangential- or diagonal process can be executed by the already available machine axles.
- the tool unit comprised of the gear wheel 6 and the roll 7 can be pulled off by the work piece spindle 1 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
- The invention relates to a truing tool for truing an essentially cylindrical grinding worm that is arranged on a tool spindle of a machine suitable for the continuous generation grinding in the tangential or diagonal process.
- Cylindrical grinding worms are used for the continuous generation grinding of gear wheels. Because the grinding worm is subject to natural wear and tear during this process, it must be trued from time to time. In the truing process, material is machined off the flanks or the treads of the grinding worm so that the head area of the thread(s) is getting narrower. Therefore, in addition to the tool for the profiling of the grinding worm, a tool is also required to adapt the diameter of the addendum circle of the grinding worm. The diameter of the addendum circle is decreased such that the head area of the thread(s) of the grinding worm again has the originally provided width.
- Thus, the means for truing the grinding worm therefore comprises two separate tools. The tool for the profiling of the flanks of the grinding worm, for example, can be a profile-grinding wheel. With two such tools, the truing of the grinding worm is generally not effected at the place on the machine where the workpiece, i.e. the gear wheel, will be machined later on. However, for reasons of precision, it is desired that the truing process occur at the location where the grinding worm later machines the workpieces.
- It has been proposed in U.S. Patent Application Publication No. 2004/0005843 (corresponding to German Patent Application Publication No. 102 20 513) to use an essentially cylindrical gear wheel to profile the flanks of the grinding worm. The profiling gear has an abrasive coating on the surface that is active during truing and the gear is taken up on the work piece spindle of the machine in place of the work piece. Because the only function of said gear is to profile the flanks of the grinding worm, an additional means to adapt the diameter of the addendum circle of the grinding worm is required.
- The invention is based on the problem to develop the generic truing tool such so as to simplify the loading concept and shorten the duration of the machining of the grinding worm.
- In accordance with the invention, this problem is solved with a truing tool that is characterized by an essentially cylindrical gear wheel having an abrasive coating on the surface that is active during truing to profile the flanks of the grinding worm, and an essentially cylindrical roll having an abrasive coating on the circumferential surface to adapt the diameter of the addendum circle of the grinding worm, with the gear wheel and the roll being axial- and torsion-resistantly connectable to the work piece spindle of the machine.
- The sole figure of the illustration shows in longitudinal section a work piece spindle of a machine for the continuous generation grinding of gear wheels in the tangential or diagonal process.
- The invention will now be explained in the following greater detail by means of the embodiment illustrated by the drawing.
- The fact that both components of the truing tool can be accommodated on the work piece spindle simplifies the loading concept. Additional time is saved in that the truing of the flanks of the grinding worm and the adaptation of the diameter of the addendum circle of the same can be effected in one work cycle.
- The gear wheel and the roll can be developed such that they can be connected axial- and torsion-resistantly to the work piece spindle independent of one another. For various reasons, however, it is more advantageous that the gear wheel and the roll are connected to one another with torsion strength and that they can be connected to the work piece spindle axially and torsion-resistantly as a tool unit. For this purpose, the gear wheel and the roll could be developed in one piece. In this case, however, the entire tool must be replaced if the gear wheel is worn out, even though the roll has a significantly longer service life than the gear wheel.
- Developing the gear wheel and the roll as a one- or two-component tool unit enables a standardization of the truing tool in an advantageous manner. To true various grinding worms, a set of truing tools with uniform interior diameter, which are different only with respect to the outer diameter and the gear geometry, the module, the angle of engagement and the helix angle of the gear wheel, are sufficient.
- A
gearwheel 2 is clamped on the upper free end of thework piece spindle 1 in the illustration. The gear wheel is being precision-machined with acylindrical grinding worm 3 indicated by an elliptical outline. The grindingworm 3 is arranged torsion-resistantly on a tool spindle (not shown). Because the construction of a machine used for the continuous generation grinding is principally known, a detailed explanation of the machine is not necessary. - The free end area of the
work piece spindle 1 turns into a cylindrical area with an enlarged diameter via a conical area, with a ring shoulder connecting to said cylindrical area with enlarged diameter. On the other end, thework piece spindle 1 has aring flange 5 withborings 4 to attach on a drive shaft of the machine. A truing tool to true thegrinding worm 3 is comprised of an essentially cylindrical truing gear wheel 6 (simply referred to as “gear wheel” in the following) and of an essentially cylindrical truing roll 7 (simply referred to as “roll” in the following) which are combined into one tool unit in the manner described below. - The
gear wheel 6 has an abrasive coating on its surface that is active during truing, i.e., in the area of the tooth flanks. In the same way, theroll 7 also has an abrasive coating on the circumferential surface. Thegear wheel 6 and thetruing roll 7 have the same interior diameter, which is slightly larger than the outer diameter of the cylindrical area of thework piece spindle 1. Thegear wheel 6 and theroll 7 have corresponding annular projections and/or recesses for reciprocal centering. - As shown on the left side of the illustration, the
gear wheel 6 and theroll 7 have a plurality, preferably three, aligned borings, with the borings developed in the gear wheel having a larger diameter, for reasons explained below. Corresponding tappedholes 9 are arranged in the ring shoulder of thework piece spindle 1. - In the assembly of the truing tool, a
locking screw 12 is first inserted into the borings of thegear wheel 6, and then a threadedbushing 10 is screwed onto the locking screw and countered with anut 11. - As shown in the right half of the illustration, the
gearwheel 6 has a plurality, preferably three, staggered borings across the circumference. Theroll 7 has corresponding tapped holes so that thegear wheel 6 and theroll 7 can be connected torsion-resistantly with thescrews 8. This tool unit, which is formed by thegear wheel 6 and theroll 7, is arranged on the cylindrical area of thework piece spindle 1. Thelocking screws 12 are then screwed into the corresponding tappedholes 9 of thework piece spindle 1 so that thegear wheel 6 abuts the ring shoulder of the work piece spindle. The segment of the cylindrical area of thework piece spindle 1 that borders the ring shoulder has a slightly enlarged outer diameter, which results in a press fit with thegear wheel 6. The tool unit comprised of thegear wheel 6 and theroll 7 is therefore axial- and torsion-resistantly connected to thework piece spindle 1 in concentric arrangement. - If the
grinding worm 3 has to be trued because of wear and tear, the tool spindle and thework piece spindle 1 are moved relative toward one another to engage the grindingworm 3 and thegear wheel 6 under a suitable angle. The flanks of the grindingworm 3 are then profiled in a tangential- or diagonal process. In doing so, only the technological variables such as infeed, feed and rotational speed of the grindingworm 3 must be coordinated with the specific truing task. All movements required for the truing of the grinding worm in the tangential- or diagonal process can be executed by the already available machine axles. - After the flanks of the
grinding worm 3 and thegear wheel 6 have been profiled, there is a relative movement of thework piece spindle 1 and the tool spindle to arrange thegrinding worm 3 opposite theroll 7. More specifically, thegrinding worm 3 is brought into engagement with the abrasive circumferential surface of theroll 7 to adapt the diameter of the addendum circle. The profiling of the flanks of the grinding worm and the required adaptation of the diameter of the addendum circle are then performed in one work cycle. - With a standardized set of truing tools comprised of
gear wheel 6 androll 7 having a uniform interior diameter, it is possible to true grindingworms 3 with various profiles. - If the
gear wheel 6 has to be replaced because of wear and tear, thelocking screws 12 are screwed out of the threadedborings 9 of thework piece spindle 1. As a result, the threadedbushing 10, which is connected with torsion resistance to thelocking screw 12 by thenut 11, abuts theroll 7. If thelocking screw 12 is screwed further out of the threaded boring 9, an axial force is exerted on theroll 7, which is transmitted to thegear wheel 6 through thescrews 8. Under said axial force, thegear wheel 6 is pushed off by thework piece spindle 1. As soon as thegear wheel 6 has been displaced sufficiently far away axially relative to thework piece spindle 1 so that the press fit turns into a sliding fit, the tool unit comprised of thegear wheel 6 and theroll 7 can be pulled off by thework piece spindle 1. - While the invention has been described with reference to preferred embodiments it is to be understood that the invention is not limited to the particulars thereof. The present invention is intended to include modifications which would be apparent to those skilled in the art to which the subject matter pertains without deviating from the spirit and scope of the appended claims.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10322181A DE10322181B4 (en) | 2003-05-16 | 2003-05-16 | Dressing tool for dressing a grinding worm |
DE10322181.6 | 2003-05-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20040235401A1 true US20040235401A1 (en) | 2004-11-25 |
US7204243B2 US7204243B2 (en) | 2007-04-17 |
Family
ID=33016428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/828,702 Expired - Fee Related US7204243B2 (en) | 2003-05-16 | 2004-04-21 | Truing tool for truing a grinding worm |
Country Status (5)
Country | Link |
---|---|
US (1) | US7204243B2 (en) |
EP (1) | EP1477256B1 (en) |
JP (1) | JP4494861B2 (en) |
AT (1) | ATE337881T1 (en) |
DE (2) | DE10322181B4 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050221732A1 (en) * | 2004-04-06 | 2005-10-06 | The Gleason Works | Method for dressing a grinding worm |
US20050239385A1 (en) * | 2004-04-22 | 2005-10-27 | Reishauer Ag | Grinding worm, profiling gear and process for the profiling of the grinding worm |
US20060021610A1 (en) * | 2004-07-27 | 2006-02-02 | The Gleason Works | Dressing tool for profiling the tip area of a threaded grinding wheel |
DE102005034119B3 (en) * | 2005-07-21 | 2006-12-07 | Siltronic Ag | Semiconductor wafer processing e.g. lapping, method for assembly of electronic components, involves processing wafer until it is thinner than rotor plate and thicker than layer, with which recess of plate is lined for wafer protection |
US20110151756A1 (en) * | 2009-12-17 | 2011-06-23 | Reishauer Ag | Full profile dressing roll for dressing multi-start cylindrical grinding worms |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110434754B (en) * | 2019-08-10 | 2021-03-02 | 哈尔滨工业大学 | Mechanical grinding process of high-precision monocrystal diamond conical pressure head |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5843A (en) * | 1848-10-10 | Machine fob mtakiiirg spikes | ||
US1823734A (en) * | 1926-04-22 | 1931-09-15 | Pratt & Whitney Co | Gear grinder and the like |
US2824556A (en) * | 1954-05-24 | 1958-02-25 | Wickman Ltd | Method and means for shaping and trimming helically formed grinding wheels |
US3077877A (en) * | 1959-12-21 | 1963-02-19 | Nat Broach & Mach | Hone dressing apparatus |
US4502456A (en) * | 1981-10-08 | 1985-03-05 | Hauni-Werke K/o/ rber & Co. KG | Apparatus for dressing grinding wheels |
US5857896A (en) * | 1996-06-26 | 1999-01-12 | Reishauer Ag | Method and device for the fine machining of spur or helical gear wheels |
US6234880B1 (en) * | 1999-03-11 | 2001-05-22 | Reishauer Ag | Device and method for profiling grinding worms |
US6290574B1 (en) * | 1999-03-11 | 2001-09-18 | Reishauer Ag | Method and device for centering a dressing tool in the thread of a grinding worm |
US6379217B1 (en) * | 1999-02-09 | 2002-04-30 | Reishauer Ag | Process and device for dressing a grinding worm and for grinding pre-cut toothed workpiece |
US20030027507A1 (en) * | 2001-07-05 | 2003-02-06 | Horst Stollberg | Dressing of grinding tools for gear grinding |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH659028A5 (en) * | 1983-03-30 | 1986-12-31 | Reishauer Ag | Dressing gear for profiling a grinding worm. |
DE58904886D1 (en) * | 1988-02-12 | 1993-08-19 | Reishauer Ag | DISC-SHAPED, ROTATING TOOL FOR PROFILING CYLINDRICAL GRINDING WHEELS FOR GRINDING GEARS. |
DE10220513B4 (en) | 2002-05-08 | 2004-04-15 | Gleason-Pfauter Maschinenfabrik Gmbh | Process for dressing or profiling a cylindrical or essentially cylindrical grinding worm |
-
2003
- 2003-05-16 DE DE10322181A patent/DE10322181B4/en not_active Expired - Fee Related
-
2004
- 2004-03-11 AT AT04005781T patent/ATE337881T1/en not_active IP Right Cessation
- 2004-03-11 DE DE502004001306T patent/DE502004001306D1/en not_active Revoked
- 2004-03-11 EP EP04005781A patent/EP1477256B1/en not_active Revoked
- 2004-04-21 US US10/828,702 patent/US7204243B2/en not_active Expired - Fee Related
- 2004-05-14 JP JP2004144614A patent/JP4494861B2/en not_active Expired - Fee Related
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5843A (en) * | 1848-10-10 | Machine fob mtakiiirg spikes | ||
US1823734A (en) * | 1926-04-22 | 1931-09-15 | Pratt & Whitney Co | Gear grinder and the like |
US2824556A (en) * | 1954-05-24 | 1958-02-25 | Wickman Ltd | Method and means for shaping and trimming helically formed grinding wheels |
US3077877A (en) * | 1959-12-21 | 1963-02-19 | Nat Broach & Mach | Hone dressing apparatus |
US4502456A (en) * | 1981-10-08 | 1985-03-05 | Hauni-Werke K/o/ rber & Co. KG | Apparatus for dressing grinding wheels |
US5857896A (en) * | 1996-06-26 | 1999-01-12 | Reishauer Ag | Method and device for the fine machining of spur or helical gear wheels |
US6379217B1 (en) * | 1999-02-09 | 2002-04-30 | Reishauer Ag | Process and device for dressing a grinding worm and for grinding pre-cut toothed workpiece |
US6234880B1 (en) * | 1999-03-11 | 2001-05-22 | Reishauer Ag | Device and method for profiling grinding worms |
US6290574B1 (en) * | 1999-03-11 | 2001-09-18 | Reishauer Ag | Method and device for centering a dressing tool in the thread of a grinding worm |
US20030027507A1 (en) * | 2001-07-05 | 2003-02-06 | Horst Stollberg | Dressing of grinding tools for gear grinding |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050221732A1 (en) * | 2004-04-06 | 2005-10-06 | The Gleason Works | Method for dressing a grinding worm |
US7294046B2 (en) | 2004-04-06 | 2007-11-13 | The Gleason Works | Method for dressing a grinding worm |
US20050239385A1 (en) * | 2004-04-22 | 2005-10-27 | Reishauer Ag | Grinding worm, profiling gear and process for the profiling of the grinding worm |
US8113915B2 (en) * | 2004-04-22 | 2012-02-14 | Reishauer Ag | Grinding worm, profiling gear and process for the profiling of the grinding worm |
US20060021610A1 (en) * | 2004-07-27 | 2006-02-02 | The Gleason Works | Dressing tool for profiling the tip area of a threaded grinding wheel |
US7118459B2 (en) | 2004-07-27 | 2006-10-10 | The Gleason Works | Dressing tool for profiling the tip area of a threaded grinding wheel |
DE102005034119B3 (en) * | 2005-07-21 | 2006-12-07 | Siltronic Ag | Semiconductor wafer processing e.g. lapping, method for assembly of electronic components, involves processing wafer until it is thinner than rotor plate and thicker than layer, with which recess of plate is lined for wafer protection |
US20110151756A1 (en) * | 2009-12-17 | 2011-06-23 | Reishauer Ag | Full profile dressing roll for dressing multi-start cylindrical grinding worms |
US8597085B2 (en) * | 2009-12-17 | 2013-12-03 | Reishauer Ag | Full profile dressing roll for dressing multi-start cylindrical grinding worms |
Also Published As
Publication number | Publication date |
---|---|
DE502004001306D1 (en) | 2006-10-12 |
JP2004338085A (en) | 2004-12-02 |
EP1477256A1 (en) | 2004-11-17 |
JP4494861B2 (en) | 2010-06-30 |
DE10322181A1 (en) | 2004-12-23 |
EP1477256B1 (en) | 2006-08-30 |
DE10322181B4 (en) | 2005-05-25 |
US7204243B2 (en) | 2007-04-17 |
ATE337881T1 (en) | 2006-09-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GLEASON WORKS, THE, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHAUER, ENGELBERT;REEL/FRAME:015249/0736 Effective date: 20040413 |
|
AS | Assignment |
Owner name: MANUFACTURES AND TRADERS TRUST COMPANY, AS COLLATE Free format text: SECURITY INTEREST;ASSIGNORS:GLEASON WORKS, THE;GLEASON CUTTING TOOLS CORPORATION;REEL/FRAME:015653/0831 Effective date: 20040727 |
|
AS | Assignment |
Owner name: MANUFACTURERS AND TRADERS TRUST COMPANY, AS COLLAT Free format text: SECURITY INTEREST;ASSIGNORS:GLEASON WORKS, THE;GLEASON CUTTING TOOLS CORPORATION;REEL/FRAME:015661/0001 Effective date: 20040727 |
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